This appears to be a mass of Harlequin Ladybirds emerging from their larval stage en masse, using the wooden handrail and brick wall at a local college. Most were static, or walking around with their wings out (drying?); some seemed to be gathering in the cracks between fence and posts.

Not brilliant shots, as they were taken quickly with my point and click camera with no flash, no tripod in low light, and stripes on some of the images since I got water on the back of the camera.

Pagham Harbour's just north of Selsey Bill, or about 7km from Chichester as the crow flies.

The first time I went there I walked the scenic route, walking down the canal and then deciding to just keep going until I got to the sea.  Needless to say, this time we went a more conventional way, on a bus!